Means for cooling transformers



1,641,702 p 1927" s. D. SPRONG MEANS FOR COOLING TRANSFORMERS Filed May4, 1925 Inventor: Severn D. Spron' y wa His Attorney.

Patented Sept. 6, 1927.

UNITED STATES PATENT OFFICE.

SEVERN D. SPRONG, 0F BROOKLYN, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

MEANS FOR COOLING TRANSFORMERS.

Application filed May 4,

of heat dissipation istherefore highly de sirable as it will result inpermitting the transformer to carry a greater maximum load withoutoverheating.

The walls and floor of a manhole casing are in intimate contact with thesurrounding earth which is often moist or otherwise of such characterthat it is a good conductor of heat. The general object of the inventionis to provide an improved arrangement to take advantage of this fact toincrease the cooling of anencased oil immersed trans former bycirculating a suitable heat absorbing liquid such as'the oil in contactwith surfaces which are in good thermal relation with the manholecasing, whence heat may be given up to the cool earth surrounding themanhole.

The invention will be better understood from the following descriptiontaken in connection with the .accompanying drawing in which Fig. 1 is avertical sectional view of a manhole containing an encased transformerof the oil immersed type, the wall or casing of the manhole having apipe or conduit embedded therein for the circulation and" cooling of oilfrom the transformer. casing; Figs. 2 and 3 are similar sectional viewsof .manholes showing modified forms of the invention, and Fig. 4 is adetail sectional view on the line 44 of Fig. 3. ,1

Like reference characters refer to similar parts in the difierentfigures of the drawing.

In the particular arrangement shown in Fig. 1, the manhole comprises afloor 10, walls 11, and a top 12, the top having an opening with a cover13 to permit access to the inside of the manhole. The manhole containsan encased transformer 14 of the oil immersed type. A pipe or conduit 15is em bedded at a convenient place in the manwalls being corrugated, asshown in .in Figs. 1 an heat from the oil are built into the manhole.

1925. Serial No. 27,655.

hole casing and connected through suitable valves 16with the upper andlower parts of the C'3.S1Ilg of the transformer14. As the 011 1n thecasing of the transformer 14 is heated, it is thus permitted to flow byconvection through the pipe or conduit 15 to be, cooled before returningto the transformer. I

In the arran ement shown in Fig. 2, a metal radiator 1 is secured to theinner face of the manhole wall, a suitable cement or compound havinggood heat conducting qualities being used if desirable between theradiator and the wall to im rove the heat conductivity between the oilin the radiator and the casing wall. The radiator .17 is connectedthrough valves 16 with the upper and lower parts of the transformercasing 14 as in the arrangement shown in Fig. 1.

In the arrangement shown in Figs. 3 and 4, a metal radiator 18'is builtinto and forms a section of the wall 11 of the manhole. This radiator 18comprises an upper header 19 communicating with the upper part of thetransformer casing-'14 and a lower header 20 communicating with thelower part of the transformer casing. The headers 19 and 20 are spacedapart by a radiator section formed of two side walls of sheet metalwelded into the headers, the outer of tlFrese 1 4, to increase its areaof contact with tlge surrounding earth.

The arrangement shown in Fig. 2 is particularly applicable in connectionwith manholes which are already built as the radiator 17 may beinstalled without distuibing the manhole casin In the arrangements shown3, theparts for dissipating casing and are thus more particularlyapplicable when they may be installed during the construction of newmanholes.

The invention provides .a simple and eflicientmeans for increasing theload capacity of a transformer in a manhole and this is frequently ofgreat advantage, particularly in manholes in large cities where it isoften very diflicult to provide suflicient transformer capacity in thelimited space available.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. An underground manhole, a transformer immersed in oil within a casinginslde said manhole, heat radiating means having a sur- 1- face i oodthermal relation with-the casmg of said manhole, and means for conduct-011 from the transformer easing lIltO v contact with said surface.

2. An underground manhole, a transformer immersed 1n 011 within a caslnglnslde said manhole, the casing of said manhole comprising a sectionhaving oil conducting passages, and means for conducting oil from saldtransformer casing to said passages and back to sand transformer casing.

3. An underground manhole, a transform er within a casing lIlSlde saidmanhole, heat radiating means having a surface 1n good thermal relationwith the casing of said 15 my hand this 28 day of April, 1925.

SEVERN D. SPRONG.

